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Keeping a vase/bowl upside down in my goldfish aquarium

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I have a 30 gallon aquarium with a young oranda and ryukin - I was trying to decorate it very simple and kind of zen-like. I have had a glass vase in the aquarium with a plastic flower for a few weeks and it looked really nice - but today, my goldies decided they like hanging out inside the vase - the problem is once they get in, they can't get out - So I was wondering if I could keep the vase in the tank upside down - would that be bad as far as water quality/circulation goes? Could it breed a freak bacteria? I change the water and vacuum the bottom once a week - THANKS!!!

I would also try something other than turning it upside down. I don't know that anything would happen to it since it would never be exposed to air but having water the is not circulating throughout the tank would worry me.